package cn.wzy.config;

import lombok.AllArgsConstructor;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

import java.util.ArrayList;
import java.util.List;

@Component
  @Primary
  @AllArgsConstructor
  public class SwaggerProvider implements SwaggerResourcesProvider {
      public static final String API_URI = "/v2/api-docs";
      private final RouteLocator routeLocator;
      private final GatewayProperties gatewayProperties;
  
  
      @Override
      public List<SwaggerResource> get() {
          List<SwaggerResource> resources = new ArrayList<>();
          List<String> routes = new ArrayList<>();
          routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
          gatewayProperties.getRoutes().stream().filter(routeDefinition -> routes.contains(routeDefinition.getId()))
                  .forEach(routeDefinition -> routeDefinition.getPredicates().stream()
                          .filter(predicateDefinition -> ("Path").equalsIgnoreCase(predicateDefinition.getName()))
                          .forEach(predicateDefinition -> resources.add(swaggerResource(routeDefinition.getId(),
                                  predicateDefinition.getArgs().get(NameUtils.GENERATED_NAME_PREFIX + "0")
                                          .replace("/**", API_URI)))));
          return resources;
      }
  
      private SwaggerResource swaggerResource(String name, String location) {
          SwaggerResource swaggerResource = new SwaggerResource();
          swaggerResource.setName(name);
          swaggerResource.setLocation(location);
          swaggerResource.setSwaggerVersion("2.0");
          return swaggerResource;
      }
  }